Wax-thread sewing-machine.



'PATENTED SEPT. 1, 1903 W. J. DOBSON. WAX THREAD SEWING, MACHINE.

APPLICATION FILED 28,, 1903.

4 BHEETS-SHEET 1.

NO MODEL.

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PATENTED SEPT. 1, 1903.

W. J. DOBSON.

WAX THREAD SEWING MACHINE.

APPLIOATIOKIILED JAN. 28, 1903.

4 SHEETS-SHEET 2.

N0 MODEL.

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. J. DOBSON.

WAX THREAD SEWING MACHINE.

APPLICATION FILED JAN. 28, 1903.

4 SEEETSSHEET 3.

N0 MODEL.

M t H a v n 3 PATENTBD SEPT. 1, 1903.

W. J. DOBSON. WAX THREAD SEWING MACHINE.

APPLICATION FILED JAN. 28, 1903.

4 SHEETS-SHEET 4.

N0 MODEL.

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2x 1 hwowo attoznu o UNITED STATES Fatented September l, 1963'.

PATENT OFFICE.

WAX-THREAD SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 738,011, dated September 1, 1903.

Application filed January 28, 1903. $erial No. 140,949. (No model.)

' To all whom, it may concern:

Be it known that I, WARREN JOSEPH DOB- SON, a citizen of the United States, residing at Buford, in the county of Gwinnett and State of Georgia, have invented certain new and useful Improvements in Sewing- Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in sewing-machines, and it relates more especially to that class of sewing-machines called wax-thread sewing-machines intended for use in sewing leather or heavy material.

My invention will be understood by reference to the accompanying drawings, in which the same parts are indicated by the same letters throughout the several views.

Figure 1 represents a section through the frame of the machine, showing the working parts in elevation. Fig. 2 is a plan view of the device shown in Fig. 1.

Fig. 4 represents a detail showing the guide for the cam-rod for operating the shuttle. Fig. 5 represents a section on the line 5 5 of Fig. 1 looking in the direction of the arrows. Fig. 6 represents a detail showing the shuttleholder. Fig. 7 is a sectional elevation through the head of the machine. Fig. 8 is a section along the line 8 8 of Fig. 7 and looking in the direction of the arrows. Fig. 9 is an end view showing shuttle and needle in dotted lines. Fig. 10 represents a section on the line 10 10 of Fig. 9 and looking in the direction of the arrows. Fig. 11 is a side elevation of the shuttle. Fig. 12 is an inverted plan view of the same. Fig. 13 is a top view of the same; and Fig. la is a diagram showing the coactiffon of the needle, looper, shuttle, and cast- 0 Arepresents a frame or casing in which the parts are mounted.

B represents a main shaft which is driven by any suitable source of power-as, for instance, the pulley 13.

0 represents the connecting-rod, connecting the crank of the main shaft to the crank D Fig. 3 is an end i View as seen from the left of Figs. 1 and 2. Fig. 4 represents a section on the line 4. 4 of 1 Fig. 1 looking in the direction of the arrows.

on the needle-operating shaft D. This shaft D carries the crank D connected by the link E and pin E to the needle-bar F, carrying the needle f. This needle-bar travels in a guideway in the crank F on the feed-shaft F which shaft is rocked by means of the pin g (see Fig. 5) on the link G, which is connected to the crank I) on the needle-shaft D, and thus the needle is rocked, causing it to feed the material. The length of the stitch is varied by providing slots g and f in the link G and the crank F and by adjusting the position of the nut 72. on the screw H, which is pivoted by the pin h in the slot g. By adjusting this nut 77. the length of the stitch may be varied within predetermined limits. The thread is swung into the path of the needle by means of the looper K, which is mounted on the rock-shaft K. This shaft carries a crank 7c, connected to the sliding bar K which slides in the guide a. This bar K carries a roller 1.5 which engages in the cam-groove b and the disk B, fast to the main shaft 13. As this disk rotates, the shaft K will be rocked, and the thread will be alternately swung into and out of theline of travel of the needle. This disk B carries a lug b, which intermittently strikes the lever L, causing the roller L to bind the thread in the guide a (See Fig. 7.) This lever L is pivoted to the frame A, as at a. The thread is rove through the eye nof the take-up N, which is pivoted to the lever N, pivoted in the frame, as at n,and having its opposite end drawn upward bya spring N This lever N will beIcaused, by weight of the bar N and the action of the spring N to bear on the cam B which is fast to the main shaft B, and thus the intermittent action of the takeup is caused by the rotation of said shaft.

M represents an eccentric-rod connected by the eccentric-strap 1V to the eccentric B on the main shaft B. This rod is pivoted, as at m, to the stem M carrying the awl m and thus reciprocal motion is imparted to the awl when the main shaft revolves. The cooperation of the awl and the needle is well known in the art and need not be further described. The sewing-thread leaves the spool A (see Fig. 1) and passes through the wax-cup A and then through suitable guides, including the opening (t the eye of the take-up, and

the barb of the needle, and is dragged through 1 firmly on the material being sewed, except the leather in the manner well known to the art.

The machine, as already described, would operate as a chain-stitch machine; but in order to provide for its use either as a chainstitch or as a lock-stitch machine I provide the shuttle and the mechanism for operating the same and means for throwing said mechanism out of operation, that will now be described.

B represents a disk on the main shaft B, having a cam-groove b engaging the rollerp on the connecting-rod P, which rod passes through the guide A, to be hereinafter more fully described, and is pivoted to the crank 19 on the shuttle-shaft P, carrying the shuttle-holder Q. This shuttle-holder has lugs q and q, (see Fig. 6,) engaging recesses r and 1', (see Figs. 11 and 12,) in the shuttle R. The shuttle is curved, as shown, and travels in an arc-shaped raceway in the frame. By proper adjustments the shuttle is caused to pass through the loop-thread above the neodle when the parts are in the position shown in Fig. 14, and to remove the thread from the needle I provide a curved heel or cast-off R on the shuttle, which presses the thread out of engagement with the barb of the needle when the shuttle passes through the loop, thus leaving the needle perfectly free of the thread and ready to go back through the material being sewed to make another stitch. With this mechanism for operating the shuttle the machine will operate as an ordinary lock-stitch machine; but in order to throw the shuttle out of operation when desired and have the machine operate as a chainstitch machine [provide the openingA,olosed by a suitable door in the casing at or near the guide A By opening this door and springing the head of the rod P back to clear the rollerp from the cam-groove b drawing the rod back in the elongated guideway ct of the guide A and then swinging the head of the rod to the dotted position in the side of the recess as shown in Fig. 4", the shuttleoperating mechanism will be thrown out of operation and will not operate until the roller 19 is restored to the initial position in engagement with the cam-groove b be seen that I provide mechanism by means of which the shuttle may be readily thrown out of or into action, and thus the machine may be converted from a chain-stitch to a lock-stitch, or vice versa, at will.

u represents the presser foot, which is moved up and down by means of the bar U and the hook U, engaging the cam B on the main shaft B. This bar U carries the pin n, which engages the spring V, (see Fig. 7,) the said spring tending to press the presser-foot Thus it will when it is lifted by the cam B It will be obvious that various modifications in the herein-described apparatus might be made which could be used without departing from the spirit of my invention.

Having thus described my invention, what I claim, and desire to secure by Letters Patent of the United States, is

1. In a sewing-machine, the combination with a continuously-operated looper, and a. barbed needle and means for operating the same, of a shuttle and mechanism for operating the same, and means for throwing said mechanism into or out of operation when desired, whereby a lock-stitch or a chain-stitch may be made at the will of the operator, substantially as described.

2. In a sewing-machine, the combination with a.continuously-operated looper, and a barbed needle, and means for reciprocating the same, of a shuttle, a rock-shaft vibrating said shuttle, a main driving-shaft, a cam carried by the main shaft, and a connecting-rod adapted to be thrown into and out of engagement with said cam when desired, and connecting said cam and said rock-shaft,whereby a lock-stitch or a chain-stitchmay be made at the will of the operator, substantially as and for the purposes described.

3. In a sewing-machine, the combination with a continuously-operated looper, and a barbed needle and means for operating the same, a shuttle having a curved lug or castofi projecting from the base thereof, and adapted to'cast the thread off of the needle, mechanism for vibrating said shuttle, and means for throwing said mechanism into or out of operation when desired, whereby a lockstitch or a chain-stitch may be made at the will of the operator, substantially as described.

4. In a sewing-machine,the combination with a continuously-operated looper, and a barbed needle, and means for reciprocating the same, and for simultaneously feeding the material, of a shuttle having a curved lug or cast-off projecting from the base thereof, and adapted to cast the thread ofi of the needle, mechanism for vibrating said shuttle, and means for throwing said mechanism into or out of operation when desired, whereby a lock-stitch or a chain-stitch may be made at the will of the operator, substantially as described. V

In testimony whereof I affix my signature in presence of two witnesses.

WARREN JOSEPH DOBSON.

Witnesses:

E. O. WILLIAMs, D. H. GAGE. 

